package InterpretMod;

import java.util.HashMap;
import java.util.Map;

public class code {

    // 表达式接口
    interface Expression {

        void interpret(String command);
    }

// COPY VIEW 表达式类
    class CopyViewExpression implements Expression {

        private String sourceDB;
        private String destinationDB;

        public CopyViewExpression(String sourceDB, String destinationDB) {
            this.sourceDB = sourceDB;
            this.destinationDB = destinationDB;
        }

        @Override
        public void interpret(String command) {
            System.out.println("Copying views from " + sourceDB + " to " + destinationDB);
            // 实际的数据库操作代码将在这里执行
        }
    }

// MOVE TABLE 表达式类
    class MoveTableExpression implements Expression {

        private String tableName;
        private String sourceDB;
        private String destinationDB;

        public MoveTableExpression(String tableName, String sourceDB, String destinationDB) {
            this.tableName = tableName;
            this.sourceDB = sourceDB;
            this.destinationDB = destinationDB;
        }

        @Override
        public void interpret(String command) {
            System.out.println("Moving table " + tableName + " from " + sourceDB + " to " + destinationDB);
            // 实际的数据库操作代码将在这里执行
        }
    }

// 上下文类
    class Context {

        private Map<String, Expression> expressions = new HashMap<>();

        public void addExpression(String key, Expression expression) {
            expressions.put(key, expression);
        }

        public void executeCommand(String command) {
            String[] parts = command.split(" ");
            String commandType = parts[0];
            String sourceDB = parts[3];
            String destinationDB = parts[5];

            Expression expression = expressions.get(commandType);
            if (expression != null) {
                expression.interpret(command);
            } else {
                System.out.println("Unknown command: " + command);
            }
        }
    }

}
